Mr. Meeseeks is a blue humanoid character from the show Rick & Morty that poofs into existence upon pressing the button on the Meeseeks Box. Meeseeks are not born fumbling for meaning. They are created to serve a singular purpose to which they will go to any lengths to fulfill. Existence is pain to a Meeseeks.
Mr. Meeseeks #1: I'm Mr. Meeseeks, look at me!
Mr. Meeseeks #2: Hi Mr. Meeseeks, I'm Mr. Meeseeks! Look at me!
Mr. Meeseeks #1: Hi!
Someone who cannot survive without constant attention from other people. Common sayings are "watch this", "look at me", "look what I can do", etc. See: Attention whore. From Rick and Morty episode "Meeseeks and Destroy", where a character named "Mr. Meeseeks" always shouts "look at me!!!"
July 1st Holiday Celebration in the Loadout video game community.
This comes from the Loadout Community where a non-native english speaking player was attempting to ask about Canadian holidays and if, in fact, Canada had a day celebrating the "meese species" in chat. After some confusion it was discovered that he was asking if Canada had a day celebrating the moose. It snowballed from there and has taken over the entire community.